Spring Valley Junior Isaac Lee, earned the highest possible composite score of 36 on the ACT. Nationally, while the actual number of students earning a composite score of 36 varies from year to year, on average, less than one-tenth of 1 percent of students who take the ACT earn the top score. The ACT consists of tests in English, mathematics, reading and science. Each test is scored on a scale of 1–36, and a student's composite score is the average of the four test scores. Congratulations Isaac !